This 1982 film is one of the most extraordinary examples of the sci-fi genre — visually breathtaking, incredibly imaginative and years ahead of it's time.

Unfortunately, the film's legacy has been muddied by incessant fiddling and re-cutting by Ridley Scott. And if you happen to catch a version with Harrison Ford's droning voice-over, you might as well cuddle up for an inevitable nap. —XFINITY Entertainment Staff (Photo: Warner Bros)

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Welcome to Jurassic Park! This 1993 film marked the next generation of computer-animated graphics. Sure, Spielberg's T-rex may look sub-par by today's standards, but who can forget the first time they saw footage of the mighty lizard breathing on the window of an overturned car? Chilling! —XFINITY Entertainment Staff (Photo: Universal)

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Maybe one of the best films ever, 1985's "Back to the Future" is the time-travel movie all other time-travel movies aspire to be. Sure, no one really knows why the flux capacitor does what it does and why it makes time-travel possible, but we don't really care.—XFINITY Entertainment Staff (Photo: Universal)

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Speaking of time travel, this 1991 sequel to "The Terminator" featured a heavy dose of time jumping, as well as major breakthroughs in computer-generated effects. Most notable among the effects, was the liquid metal T-1000, which is sent to Earth to kill John Connor. —XFINITY Entertainment Staff (Photo: TriStar)

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What can you say about "Star Wars" that hasn't been said already? The George Lucas film is a sci-fi classic, a worldwide phenomenon and one of the most valuable franchises in movie history. And to think, most of the cast and crew thought it would be a huge failure. —XFINITY Entertainment Staff (Photo: Fox)

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Written and directed by Steven Spielberg, this 1977 film about UFOs is packed with some of the most iconic images in cinema. The ceaselessly imaginative and thrilling film has delighted audiences for decades and continues to raise curiosity about life beyond Earth. —XFINITY Entertainment Staff (Photo: Sony)

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It's rare that a sequel outshines it's predecessor. It's even rarer for a sequel to exceed a film as iconic as "Alien." Sigourney Weaver received an Oscar nomination for her return as Ellen Ripley in this film, which was more thrilling, violent and suspenseful than the original. —XFINITY Entertainment Staff (Photo: Fox)

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This groundbreaking 1968 Stanley Kubrick film has been credited with influencing the genre's greatest filmmakers, including Spielberg, Lucas and Scott. At the time, the often surreal (and very "Kubrick") film gave an unparallelled look into the worlds of science, evolution, space exploration and extraterrestrial life. Simply put, it is a masterpiece. —XFINITY Entertainment Staff (Photo: MGM)

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This 1951 film is a classic in every sense of the word, from its iconic score, to its notable quotes ("Klaatu barada nikto!"), to its distinctly '50s robot alien. More importantly, this sci-fi movie made a statement about the brewing Cold War by warning its characters (and, by extension, the audience) that dabbling in violence and nuclear weapons would lead to Earth's destruction. The themes are just as relevant today as they were 60 years ago. —XFINITY Entertainment Staff (Photo: Fox)

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One part "Romeo & Juliet," one part "The Prince and the Pauper" and one part "Frankenstein," this 1927 two-hour silent film was an absolute revelation of film-making. German director Fritz Lang injected the film with such vitriol that it ultimately became a favorite of Nazi sympathizers, a fact that reportedly embarrassed Lang.

In his 1985 book "Roger Ebert's Movie Home Companion," the critic said, "'Metropolis' is one of the great achievements of the silent era, a work so audacious in its vision and so angry in its message that it is, if anything, more powerful today than when it was made." —XFINITY Entertainment Staff (Photo: UFA)

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This 1998 remake of the popular '60s TV series featured an all-star cast... of '90s stars, including Matt LeBlanc, Lacey Chabert and Heather Graham. Although it was a boring, lifeless remake, this film did manage to knock "Titanic" from the top of the box office charts after a 15-week run. —XFINITY Entertainment Staff (Photo: New Line)

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It was only a matter of time before Keanu Reeves made it to the list. "Johnny Mnemonic," which co-stars Dolph Lundgren, Ice-T and Henry Rollins, is the story of a "mnemonic courier" (basically a human hard drive) who must elude the Yakuza to deliver information uploaded to his brain. —XFINITY Entertainment Staff (Photo: TriStar)

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With the exception of "Tin Cup," the late '90s was a bad time to be Kevin Costner. Among his epic failures was this three-hour post-apocalyptic drama about a Shakespeare-reciting vagabond who delivers 15-year-old mail. —XFINITY Entertainment Staff (Photo: Warner Bros)

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This remake of the 1956 camp classic "Invasion of the Body Snatchers" completely missed the mark. A thrill-less remake ripe with political allegory, "Invasion" is little more than a flashy action film trying to capitalize on a sci-fi pedigree. —XFINITY Entertainment Staff (Photo: Warner Bros)

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When the people of Mars become concerned that their martian children are suffering from a lack of fun and freedom, the alien leaders come to a sensible conclusion — they must kidnap Santa from Earth. Meanwhile, another alien, who disagrees with the decision, tries to kill jolly ol' St. Nick. —XFINITY Entertainment Staff (Photo: Embassy Pictures)

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Often considered one of the world's worst movies, this offensively unfunny sci-fi flick boasts one of the worst opening weekends of all time. The 2002 disaster also became one of the biggest box office bombs when it recouped only $7 million of its $100 budget. —XFINITY Entertainment Staff (Photo: Warner Bros)

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This 1988 movie tried to capitalize on the popularity of "E.T.," but ended up being a 90-minute commercial for brands such as Coca-Cola, Skittles, Sears and McDonalds. Among the movie's most laughable scenes is an impromptu dance scene featuring Ronald McDonald. —XFINITY Entertainment Staff (Photo: Orion Pictures)

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John Travolta's 2000 film "Battlefield Earth" has become synonymous with failure. This Scientology-based film regularly tops worst-of lists and boasts one of the worst box office performances in history. Often referred to as Travolta's "vanity project," it can't be overstated just how bad this movie really is. —XFINITY Entertainment Staff (Photo: Warner Bros)

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Ed Wood's classic disaster "Plan 9 from Outer Space" walks the line between so bad and so-bad-it's-good, but one thing's for sure — this is not an example of quality film-making. From its terrible actors to its use of bad stock footage to its ridiculous plot about aliens raising Earth's dead, everything about "Plan 9" makes it one of the worst sci-fi films ever produced. —XFINITY Entertainment Staff (Photo: DCA)

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